0.2.2

This is our first release since our major refactor in 0.2.1.

This release fixes numerous bugs as well as introduces some refactoring to our Dockerfile's and how we handle dependencies.

Please see below for a summary of commits from 0.2.1 to 0.2.2.

Charlie Drage <charlie@charliedrage.com> (1):
      raise exception when running run --dry-run

Dusty Mabe <dusty@dustymabe.com> (7):
      Adds more checking for docker client/server sync issues.
      utils: Adds in AtomicAppUtilsException class.
      Reworks answers file processing.
      Removes dryrun from _write_answers() function.
      Remove specific versions from required libraries.
      Reworks testing Dockerfile and test requirements.
      Reworks Dockerfiles.

Ratnadeep Debnath <rtnpro@gmail.com> (4):
      Added docs for provider and adding a new provider
      Merge config sets value for key if it or it's value is missing at source.
      Fixes in README for provider:
      Removing docker-compose provider from supported providers list.

Subin M <subin@apache.org> (1):
      remove unused method printAnswerFile

Tomas Kral <tkral@redhat.com> (1):
      add  PROVIDERS constant